<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <p>计数： <output id="result"></output></p>
<button onclick="startWorker()">开始工作</button> 
<button onclick="stopWorker()">停止工作</button>
    <script>
        var w;
        function startWorker(){
            if(typeof(Worker)!=="undefined"){
                if(typeof(w)=="undefined"){
                    w=new Worker("./demo_workers.js")
                }
                w.onmessage=function(event){
                    document.getElementById("result").innerHTML=event.data;
                }
            }else{
                document.getElementById("result").innerHTML="抱歉，你的浏览器不支持 Web Workers...";
            }
        }
        function stopWorker(){
            w.terminate();
            w=undefined;
        }
    </script>
</body>
</html>